DayNightTerminator

DayNightTerminator[]

is a one-dimensional GeoGraphics primitive that represents the separation line between the halves of the Earth currently in daytime and nighttime.

DayNightTerminator[datespec]

represents the separation line between day and night for the specified date.

Details

  • datespec can be specified as a DateObject or a string that resolves to a date.
  • A date without explicit time zone is assumed to use $TimeZone.

Examples

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Basic Examples  (2)

Display the current terminator as a line:

Show the terminator line on the summer solstice using red lines to denote the Arctic and Antarctic Circles:

Use a different projection:

Scope  (3)

DayNightTerminator[] gives a plot for the current date and time:

Using Now explicitly gives the same result:

Illustrate changes in the terminator at monthly intervals:

Specify dates in other formats:

Properties & Relations  (3)

The terminator line separates the day and night hemispheres:

Next lunar eclipse to a given date:

The night hemisphere coincides with the total phase area of the eclipse:

For a spherical model of the Earth, the terminator line is approximately a geo circle:

The true terminator and approximate terminator geo circle differ slightly when using an ellipsoidal model of the Earth:

Introduced in 2014
 (10.0)